Tap Shank & Square Chart

Sizes shown in ( ) are available in each size, Example: TER (16, 25)D -035 means the collet is available as TER16D-035 and TER25D-035

Carbide Taps will pull out of RA & TC adapters, ball bearings cannot bite into the tap shank, use TER collets for tap shanks harder than Rc64. The results will be flats on the locking balls and tap pull out.

Drag lines on a tap shank means the tap is being pulled from the holder. This indicates a lead error from programming or feed system. This is very common in turning center with live tooling due to gear back-lash.

Torque Control Adapters "MUST" be used in a Tension & Compression holder or Radial Arm system. Will not function properly in a Rigid holder.

Torque Control Adapters are adjustable torque and set to mid steel, remove snap ring and turn the slotted face disk + or - to achieve proper setting.

RA Adapters can be used in Rigid or T&C Holders

When running in Rigid holders, feed rate must match tap pitch exactly

When run in T&C Holders program feed rate for:

95-98% of pitch on in-feed

100% of pitch on extraction

This will allow the tap to pull out on the springs to cut free, 100% on reverse helps prevent tearing and pulling on the threads, holder should snap back a small amount once the tap dis-engages.